What you have is a dip in glucose at 2 hrs.... this may mean you are insulin resistant or becoming so.

Fasting glucoses can go up quite a bit, as insulin resistance continues. The glucose comes from the liver which senses low levels in the blood during the fast and converts amino acids to glucose.

This link illustrates various GTT curves that are impaired in some way:
Yours looks like #7. Reactive hypoglycemia. This happens when too much insulin is put out in response to the glucose challenge. A brief time of low sugar results until the liver kicks in to make more for you.

These graphs were copied over from another site, from years ago, that was medical. That old site is now gone. I cannot vouch therefore for the author of this new site, and what he recommends. I only post this for the data on this GTT subject.

Many people develop variants of impaired glucose tolerance long before they become diabetic. But most doctors only intervene when blood sugars become high, as that is what they basically look for. A specialist may interpret things more carefully, especially when symptoms are present.

Having a fasting INSULIN level drawn will show if elevated if you are making too much insulin and that can help pin down, if you are insulin resistant.